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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">prettyprint_usize</span>, <span class="ident">Counter</span>};
<span class="kw">use</span> <span class="ident">collisions</span>::{<span class="ident">CollisionDataset</span>, <span class="ident">Severity</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Circle</span>, <span class="ident">Distance</span>, <span class="ident">Duration</span>, <span class="ident">FindClosest</span>, <span class="ident">Polygon</span>, <span class="ident">Time</span>};
<span class="kw">use</span> <span class="ident">map_gui</span>::<span class="ident">tools</span>::<span class="ident">ColorNetwork</span>;
<span class="kw">use</span> <span class="ident">map_gui</span>::<span class="ident">ID</span>;
<span class="kw">use</span> <span class="ident">widgetry</span>::{
    <span class="ident">Choice</span>, <span class="ident">Color</span>, <span class="ident">Drawable</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">GfxCtx</span>, <span class="ident">HorizontalAlignment</span>, <span class="ident">Line</span>, <span class="ident">Outcome</span>,
    <span class="ident">Panel</span>, <span class="ident">Slider</span>, <span class="ident">State</span>, <span class="ident">Text</span>, <span class="ident">TextExt</span>, <span class="ident">Toggle</span>, <span class="ident">VerticalAlignment</span>, <span class="ident">Widget</span>,
};

<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">app</span>::{<span class="ident">App</span>, <span class="ident">Transition</span>};

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CollisionsViewer</span> {
    <span class="ident">data</span>: <span class="ident">CollisionDataset</span>,
    <span class="ident">dataviz</span>: <span class="ident">Dataviz</span>,
    <span class="ident">tooltips</span>: <span class="ident">MapspaceTooltips</span>,
    <span class="ident">panel</span>: <span class="ident">Panel</span>,
}

<span class="kw">impl</span> <span class="ident">CollisionsViewer</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</span>(<span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>;
        <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">loading_screen</span>(<span class="string">&quot;load collision data&quot;</span>, <span class="op">|</span><span class="kw">_</span>, <span class="kw-2">mut</span> <span class="ident">timer</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">all</span>: <span class="ident">CollisionDataset</span> <span class="op">=</span>
                <span class="ident">abstio</span>::<span class="ident">read_binary</span>(<span class="ident">map</span>.<span class="ident">get_city_name</span>().<span class="ident">input_path</span>(<span class="string">&quot;collisions.bin&quot;</span>), <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">timer</span>);
            <span class="ident">all</span>.<span class="ident">collisions</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> {
                <span class="ident">map</span>.<span class="ident">get_boundary_polygon</span>()
                    .<span class="ident">contains_pt</span>(<span class="ident">c</span>.<span class="ident">location</span>.<span class="ident">to_pt</span>(<span class="ident">map</span>.<span class="ident">get_gps_bounds</span>()))
            });
            <span class="ident">all</span>
        });

        <span class="kw">let</span> <span class="ident">filters</span> <span class="op">=</span> <span class="ident">Filters</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">filters</span>.<span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="ident">data</span>);
        <span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">indices</span>.<span class="ident">len</span>();
        <span class="kw">let</span> (<span class="ident">dataviz</span>, <span class="ident">tooltips</span>) <span class="op">=</span> <span class="ident">Dataviz</span>::<span class="ident">aggregated</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="kw-2">&amp;</span><span class="ident">data</span>, <span class="ident">indices</span>);

        <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">CollisionsViewer</span> {
            <span class="ident">panel</span>: <span class="ident">Panel</span>::<span class="ident">new_builder</span>(<span class="ident">Widget</span>::<span class="ident">col</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="ident">Widget</span>::<span class="ident">row</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Line</span>(<span class="string">&quot;Collisions viewer&quot;</span>).<span class="ident">small_heading</span>().<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>().<span class="ident">btn_close_widget</span>(<span class="ident">ctx</span>),
                ]),
                <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} collisions&quot;</span>, <span class="ident">prettyprint_usize</span>(<span class="ident">count</span>))
                    .<span class="ident">text_widget</span>(<span class="ident">ctx</span>)
                    .<span class="ident">named</span>(<span class="string">&quot;count&quot;</span>),
                <span class="ident">Filters</span>::<span class="ident">make_controls</span>(<span class="ident">ctx</span>).<span class="ident">named</span>(<span class="string">&quot;controls&quot;</span>),
            ]))
            .<span class="ident">aligned</span>(<span class="ident">HorizontalAlignment</span>::<span class="ident">Right</span>, <span class="ident">VerticalAlignment</span>::<span class="ident">Top</span>)
            .<span class="ident">build</span>(<span class="ident">ctx</span>),
            <span class="ident">data</span>,
            <span class="ident">dataviz</span>,
            <span class="ident">tooltips</span>,
        })
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Filters</span> {
    <span class="ident">show_individual</span>: <span class="ident">bool</span>,
    <span class="ident">time_range</span>: (<span class="ident">Duration</span>, <span class="ident">Duration</span>),
    <span class="ident">severity</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Severity</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Filters</span> {
    <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Filters</span> {
        <span class="ident">Filters</span> {
            <span class="ident">show_individual</span>: <span class="bool-val">false</span>,
            <span class="ident">time_range</span>: (<span class="ident">Duration</span>::<span class="ident">ZERO</span>, <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">24</span>)),
            <span class="ident">severity</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="doccomment">/// Returns the indices of all matching collisions</span>
    <span class="kw">fn</span> <span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">data</span>: <span class="kw-2">&amp;</span><span class="ident">CollisionDataset</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> (<span class="ident">idx</span>, <span class="ident">c</span>) <span class="kw">in</span> <span class="ident">data</span>.<span class="ident">collisions</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
            <span class="kw">if</span> <span class="ident">c</span>.<span class="ident">time</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">time_range</span>.<span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">time</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">time_range</span>.<span class="number">1</span> {
                <span class="kw">continue</span>;
            }
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">severity</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span> <span class="op">!</span><span class="op">=</span> <span class="ident">c</span>.<span class="ident">severity</span>).<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>) {
                <span class="kw">continue</span>;
            }
            <span class="ident">indices</span>.<span class="ident">push</span>(<span class="ident">idx</span>);
        }
        <span class="ident">indices</span>
    }

    <span class="kw">fn</span> <span class="ident">make_controls</span>(<span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Widget</span> {
        <span class="ident">Widget</span>::<span class="ident">col</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">Toggle</span>::<span class="ident">choice</span>(
                <span class="ident">ctx</span>,
                <span class="string">&quot;individual / aggregated&quot;</span>,
                <span class="string">&quot;individual&quot;</span>,
                <span class="string">&quot;aggregated&quot;</span>,
                <span class="prelude-val">None</span>,
                <span class="bool-val">false</span>,
            ),
            <span class="ident">Widget</span>::<span class="ident">row</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="string">&quot;Between:&quot;</span>.<span class="ident">text_widget</span>(<span class="ident">ctx</span>).<span class="ident">margin_right</span>(<span class="number">20</span>),
                <span class="ident">Slider</span>::<span class="ident">area</span>(<span class="ident">ctx</span>, <span class="number">0.1</span> <span class="op">*</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span>, <span class="number">0.0</span>).<span class="ident">named</span>(<span class="string">&quot;time1&quot;</span>),
            ]),
            <span class="ident">Widget</span>::<span class="ident">row</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="string">&quot;and:&quot;</span>.<span class="ident">text_widget</span>(<span class="ident">ctx</span>).<span class="ident">margin_right</span>(<span class="number">20</span>),
                <span class="ident">Slider</span>::<span class="ident">area</span>(<span class="ident">ctx</span>, <span class="number">0.1</span> <span class="op">*</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span>, <span class="number">1.0</span>).<span class="ident">named</span>(<span class="string">&quot;time2&quot;</span>),
            ]),
            <span class="ident">Widget</span>::<span class="ident">row</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="string">&quot;Severity:&quot;</span>.<span class="ident">text_widget</span>(<span class="ident">ctx</span>).<span class="ident">margin_right</span>(<span class="number">20</span>),
                <span class="ident">Widget</span>::<span class="ident">dropdown</span>(
                    <span class="ident">ctx</span>,
                    <span class="string">&quot;severity&quot;</span>,
                    <span class="prelude-val">None</span>,
                    <span class="macro">vec</span><span class="macro">!</span>[
                        <span class="ident">Choice</span>::<span class="ident">new</span>(<span class="string">&quot;any&quot;</span>, <span class="prelude-val">None</span>),
                        <span class="ident">Choice</span>::<span class="ident">new</span>(<span class="string">&quot;slight&quot;</span>, <span class="prelude-val">Some</span>(<span class="ident">Severity</span>::<span class="ident">Slight</span>)),
                        <span class="ident">Choice</span>::<span class="ident">new</span>(<span class="string">&quot;serious&quot;</span>, <span class="prelude-val">Some</span>(<span class="ident">Severity</span>::<span class="ident">Serious</span>)),
                        <span class="ident">Choice</span>::<span class="ident">new</span>(<span class="string">&quot;fatal&quot;</span>, <span class="prelude-val">Some</span>(<span class="ident">Severity</span>::<span class="ident">Fatal</span>)),
                    ],
                ),
            ]),
        ])
    }

    <span class="kw">fn</span> <span class="ident">from_controls</span>(<span class="ident">panel</span>: <span class="kw-2">&amp;</span><span class="ident">Panel</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Filters</span> {
        <span class="kw">let</span> <span class="ident">end_of_day</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">24</span>);
        <span class="ident">Filters</span> {
            <span class="ident">show_individual</span>: <span class="ident">panel</span>.<span class="ident">is_checked</span>(<span class="string">&quot;individual / aggregated&quot;</span>),
            <span class="ident">time_range</span>: (
                <span class="ident">end_of_day</span> <span class="op">*</span> <span class="ident">panel</span>.<span class="ident">slider</span>(<span class="string">&quot;time1&quot;</span>).<span class="ident">get_percent</span>(),
                <span class="ident">end_of_day</span> <span class="op">*</span> <span class="ident">panel</span>.<span class="ident">slider</span>(<span class="string">&quot;time2&quot;</span>).<span class="ident">get_percent</span>(),
            ),
            <span class="ident">severity</span>: <span class="ident">panel</span>.<span class="ident">dropdown_value</span>(<span class="string">&quot;severity&quot;</span>),
        }
    }
}

<span class="kw">enum</span> <span class="ident">Dataviz</span> {
    <span class="ident">Individual</span> {
        <span class="ident">draw_all_circles</span>: <span class="ident">Drawable</span>,
    },
    <span class="ident">Aggregated</span> {
        <span class="ident">unzoomed</span>: <span class="ident">Drawable</span>,
        <span class="ident">zoomed</span>: <span class="ident">Drawable</span>,
    },
}

<span class="kw">impl</span> <span class="ident">Dataviz</span> {
    <span class="kw">fn</span> <span class="ident">aggregated</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>,
        <span class="ident">data</span>: <span class="kw-2">&amp;</span><span class="ident">CollisionDataset</span>,
        <span class="ident">indices</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">Dataviz</span>, <span class="ident">MapspaceTooltips</span>) {
        <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>;

        <span class="comment">// Match each collision to the nearest road and intersection</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">closest</span>: <span class="ident">FindClosest</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">FindClosest</span>::<span class="ident">new</span>(<span class="ident">map</span>.<span class="ident">get_bounds</span>());
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_intersections</span>() {
            <span class="ident">closest</span>.<span class="ident">add</span>(<span class="ident">ID</span>::<span class="ident">Intersection</span>(<span class="ident">i</span>.<span class="ident">id</span>), <span class="ident">i</span>.<span class="ident">polygon</span>.<span class="ident">points</span>());
        }
        <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_roads</span>() {
            <span class="ident">closest</span>.<span class="ident">add</span>(<span class="ident">ID</span>::<span class="ident">Road</span>(<span class="ident">r</span>.<span class="ident">id</span>), <span class="ident">r</span>.<span class="ident">center_pts</span>.<span class="ident">points</span>());
        }

        <span class="comment">// How many collisions occurred at each road and intersection?</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">per_road</span> <span class="op">=</span> <span class="ident">Counter</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">per_intersection</span> <span class="op">=</span> <span class="ident">Counter</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">unsnapped</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="ident">indices</span> {
            <span class="kw">let</span> <span class="ident">collision</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">data</span>.<span class="ident">collisions</span>[<span class="ident">idx</span>];
            <span class="comment">// Search up to 10m away</span>
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">id</span>, <span class="kw">_</span>)) <span class="op">=</span> <span class="ident">closest</span>.<span class="ident">closest_pt</span>(
                <span class="ident">collision</span>.<span class="ident">location</span>.<span class="ident">to_pt</span>(<span class="ident">map</span>.<span class="ident">get_gps_bounds</span>()),
                <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">10.0</span>),
            ) {
                <span class="kw">match</span> <span class="ident">id</span> {
                    <span class="ident">ID</span>::<span class="ident">Road</span>(<span class="ident">r</span>) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">per_road</span>.<span class="ident">inc</span>(<span class="ident">r</span>);
                    }
                    <span class="ident">ID</span>::<span class="ident">Intersection</span>(<span class="ident">i</span>) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">per_intersection</span>.<span class="ident">inc</span>(<span class="ident">i</span>);
                    }
                    <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
                }
            } <span class="kw">else</span> {
                <span class="ident">unsnapped</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
            }
        }
        <span class="kw">if</span> <span class="ident">unsnapped</span> <span class="op">&gt;</span> <span class="number">0</span> {
            <span class="macro">warn</span><span class="macro">!</span>(
                <span class="string">&quot;{} collisions weren&#39;t close enough to a road or intersection&quot;</span>,
                <span class="ident">prettyprint_usize</span>(<span class="ident">unsnapped</span>)
            );
        }

        <span class="comment">// TODO Is it strange to not use the built-in DrawMap mouseover stuff for this?</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tooltips</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> (<span class="ident">r</span>, <span class="ident">cnt</span>) <span class="kw">in</span> <span class="ident">per_road</span>.<span class="ident">borrow</span>() {
            <span class="ident">tooltips</span>.<span class="ident">push</span>((
                <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">r</span>).<span class="ident">get_thick_polygon</span>(<span class="ident">map</span>),
                <span class="ident">Text</span>::<span class="ident">from</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} collisions&quot;</span>, <span class="ident">prettyprint_usize</span>(<span class="kw-2">*</span><span class="ident">cnt</span>))),
            ));
        }
        <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">cnt</span>) <span class="kw">in</span> <span class="ident">per_intersection</span>.<span class="ident">borrow</span>() {
            <span class="ident">tooltips</span>.<span class="ident">push</span>((
                <span class="ident">map</span>.<span class="ident">get_i</span>(<span class="kw-2">*</span><span class="ident">i</span>).<span class="ident">polygon</span>.<span class="ident">clone</span>(),
                <span class="ident">Text</span>::<span class="ident">from</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} collisions&quot;</span>, <span class="ident">prettyprint_usize</span>(<span class="kw-2">*</span><span class="ident">cnt</span>))),
            ));
        }
        <span class="kw">let</span> <span class="ident">tooltips</span> <span class="op">=</span> <span class="ident">MapspaceTooltips</span>::<span class="ident">new</span>(
            <span class="ident">tooltips</span>,
            <span class="ident">Box</span>::<span class="ident">new</span>(<span class="op">|</span><span class="ident">poly</span><span class="op">|</span> <span class="ident">GeomBatch</span>::<span class="ident">from</span>(<span class="macro">vec</span><span class="macro">!</span>[(<span class="ident">Color</span>::<span class="ident">BLUE</span>.<span class="ident">alpha</span>(<span class="number">0.5</span>), <span class="ident">poly</span>.<span class="ident">clone</span>())])),
        );

        <span class="comment">// Color roads and intersections using the counts</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">colorer</span> <span class="op">=</span> <span class="ident">ColorNetwork</span>::<span class="ident">new</span>(<span class="ident">app</span>);
        <span class="comment">// TODO We should use some scale for both!</span>
        <span class="ident">colorer</span>.<span class="ident">pct_roads</span>(<span class="ident">per_road</span>, <span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">cs</span>.<span class="ident">good_to_bad_red</span>);
        <span class="ident">colorer</span>.<span class="ident">pct_intersections</span>(<span class="ident">per_intersection</span>, <span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">cs</span>.<span class="ident">good_to_bad_red</span>);
        <span class="kw">let</span> (<span class="ident">unzoomed</span>, <span class="ident">zoomed</span>) <span class="op">=</span> <span class="ident">colorer</span>.<span class="ident">build</span>(<span class="ident">ctx</span>);

        (<span class="ident">Dataviz</span>::<span class="ident">Aggregated</span> { <span class="ident">unzoomed</span>, <span class="ident">zoomed</span> }, <span class="ident">tooltips</span>)
    }

    <span class="kw">fn</span> <span class="ident">individual</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>,
        <span class="ident">data</span>: <span class="kw-2">&amp;</span><span class="ident">CollisionDataset</span>,
        <span class="ident">indices</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">Dataviz</span>, <span class="ident">MapspaceTooltips</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">batch</span> <span class="op">=</span> <span class="ident">GeomBatch</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tooltips</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="ident">indices</span> {
            <span class="kw">let</span> <span class="ident">collision</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">data</span>.<span class="ident">collisions</span>[<span class="ident">idx</span>];
            <span class="kw">let</span> <span class="ident">circle</span> <span class="op">=</span> <span class="ident">Circle</span>::<span class="ident">new</span>(
                <span class="ident">collision</span>.<span class="ident">location</span>.<span class="ident">to_pt</span>(<span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">get_gps_bounds</span>()),
                <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">5.0</span>),
            )
            .<span class="ident">to_polygon</span>();
            <span class="ident">batch</span>.<span class="ident">push</span>(<span class="ident">Color</span>::<span class="ident">RED</span>, <span class="ident">circle</span>.<span class="ident">clone</span>());
            <span class="comment">// TODO Er, but multiple collisions can occur at exactly the same spot</span>
            <span class="ident">tooltips</span>.<span class="ident">push</span>((
                <span class="ident">circle</span>,
                <span class="ident">Text</span>::<span class="ident">from_multiline</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Line</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;Time: {}&quot;</span>,
                        (<span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">collision</span>.<span class="ident">time</span>).<span class="ident">ampm_tostring</span>()
                    )),
                    <span class="ident">Line</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Severity: {:?}&quot;</span>, <span class="ident">collision</span>.<span class="ident">severity</span>)),
                ]),
            ));
        }
        <span class="kw">let</span> <span class="ident">tooltips</span> <span class="op">=</span> <span class="ident">MapspaceTooltips</span>::<span class="ident">new</span>(
            <span class="ident">tooltips</span>,
            <span class="ident">Box</span>::<span class="ident">new</span>(<span class="op">|</span><span class="ident">poly</span><span class="op">|</span> <span class="ident">GeomBatch</span>::<span class="ident">from</span>(<span class="macro">vec</span><span class="macro">!</span>[(<span class="ident">Color</span>::<span class="ident">BLUE</span>.<span class="ident">alpha</span>(<span class="number">0.5</span>), <span class="ident">poly</span>.<span class="ident">clone</span>())])),
        );

        (
            <span class="ident">Dataviz</span>::<span class="ident">Individual</span> {
                <span class="ident">draw_all_circles</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>),
            },
            <span class="ident">tooltips</span>,
        )
    }
}

<span class="kw">impl</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">CollisionsViewer</span> {
    <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">App</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Transition</span> {
        <span class="ident">ctx</span>.<span class="ident">canvas_movement</span>();

        <span class="kw">let</span> <span class="ident">old_filters</span> <span class="op">=</span> <span class="ident">Filters</span>::<span class="ident">from_controls</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">panel</span>);
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Outcome</span>::<span class="ident">Clicked</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">event</span>(<span class="ident">ctx</span>) {
            <span class="kw">match</span> <span class="ident">x</span>.<span class="ident">as_ref</span>() {
                <span class="string">&quot;close&quot;</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">return</span> <span class="ident">Transition</span>::<span class="ident">Pop</span>;
                }
                <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
            }
        }
        <span class="comment">// TODO Should fiddling with sliders produce Outcome::Changed?</span>
        <span class="kw">let</span> <span class="ident">filters</span> <span class="op">=</span> <span class="ident">Filters</span>::<span class="ident">from_controls</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">panel</span>);
        <span class="kw">if</span> <span class="ident">filters</span> <span class="op">!</span><span class="op">=</span> <span class="ident">old_filters</span> {
            <span class="kw">let</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">filters</span>.<span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">data</span>);
            <span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">indices</span>.<span class="ident">len</span>();
            <span class="kw">let</span> (<span class="ident">dataviz</span>, <span class="ident">tooltips</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">filters</span>.<span class="ident">show_individual</span> {
                <span class="ident">Dataviz</span>::<span class="ident">individual</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">data</span>, <span class="ident">indices</span>)
            } <span class="kw">else</span> {
                <span class="ident">Dataviz</span>::<span class="ident">aggregated</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">data</span>, <span class="ident">indices</span>)
            };
            <span class="self">self</span>.<span class="ident">dataviz</span> <span class="op">=</span> <span class="ident">dataviz</span>;
            <span class="self">self</span>.<span class="ident">tooltips</span> <span class="op">=</span> <span class="ident">tooltips</span>;
            <span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} collisions&quot;</span>, <span class="ident">prettyprint_usize</span>(<span class="ident">count</span>)).<span class="ident">text_widget</span>(<span class="ident">ctx</span>);
            <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">replace</span>(<span class="ident">ctx</span>, <span class="string">&quot;count&quot;</span>, <span class="ident">count</span>);
        }

        <span class="self">self</span>.<span class="ident">tooltips</span>.<span class="ident">event</span>(<span class="ident">ctx</span>);

        <span class="ident">Transition</span>::<span class="ident">Keep</span>
    }

    <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>) {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">dataviz</span> {
            <span class="ident">Dataviz</span>::<span class="ident">Aggregated</span> {
                <span class="kw-2">ref</span> <span class="ident">unzoomed</span>,
                <span class="kw-2">ref</span> <span class="ident">zoomed</span>,
                ..
            } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">if</span> <span class="ident">g</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="ident">app</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span> {
                    <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="ident">unzoomed</span>);
                } <span class="kw">else</span> {
                    <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="ident">zoomed</span>);
                }
            }
            <span class="ident">Dataviz</span>::<span class="ident">Individual</span> {
                <span class="kw-2">ref</span> <span class="ident">draw_all_circles</span>,
                ..
            } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="ident">draw_all_circles</span>);
            }
        }
        <span class="self">self</span>.<span class="ident">tooltips</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
        <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
    }
}

<span class="comment">// TODO Apply this to a few more places, and if it works well, lift to widgetry</span>

<span class="kw">struct</span> <span class="ident">MapspaceTooltips</span> {
    <span class="comment">// TODO Quadtree</span>
    <span class="ident">tooltips</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Polygon</span>, <span class="ident">Text</span>)<span class="op">&gt;</span>,
    <span class="ident">hover</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">GeomBatch</span><span class="op">&gt;</span>,
    <span class="ident">selected</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">MapspaceTooltips</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(
        <span class="ident">tooltips</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Polygon</span>, <span class="ident">Text</span>)<span class="op">&gt;</span>,
        <span class="ident">hover</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">GeomBatch</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapspaceTooltips</span> {
        <span class="ident">MapspaceTooltips</span> {
            <span class="ident">tooltips</span>,
            <span class="ident">hover</span>,
            <span class="ident">selected</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) {
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">redo_mouseover</span>() {
            <span class="self">self</span>.<span class="ident">selected</span> <span class="op">=</span> <span class="prelude-val">None</span>;
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pt</span>) <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor_in_map_space</span>() {
                <span class="self">self</span>.<span class="ident">selected</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tooltips</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span>(<span class="ident">p</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">p</span>.<span class="ident">contains_pt</span>(<span class="ident">pt</span>));
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">selected</span> {
            <span class="kw">let</span> (<span class="ident">polygon</span>, <span class="ident">txt</span>) <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">tooltips</span>[<span class="ident">idx</span>];
            <span class="comment">// TODO Cache</span>
            <span class="kw">let</span> <span class="ident">draw</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">upload</span>((<span class="self">self</span>.<span class="ident">hover</span>)(<span class="ident">polygon</span>));
            <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="kw-2">&amp;</span><span class="ident">draw</span>);
            <span class="ident">g</span>.<span class="ident">draw_mouse_tooltip</span>(<span class="ident">txt</span>.<span class="ident">clone</span>());
        }
    }
}
</pre></div>
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